Don't know about this episode.
It points out that Wells is definately Reverse Flash, he wanted the Tackeon [sp] thing for himself. How did he appear in 2 places at once? Who knows.
How did Reverse Flash make the shield weak, simply because Dr Wells made it that way, one simple little flaw in design.
Or basically like someone stated earlier, Dr Wells is T.O. Morrow and helping out RF, misleading everyone by taking a beating and still steal that Tackeon thingy..

Note: When the Flash runs around, he shows "Yellow" lightning, not Red, but when RF runs around, his lightning is Red, so, in the Blurs... the Yellow blur is Flash and the Red Blur is RF or Zoom, who knows right.